mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-27 15:01:08 +00:00
69 lines
1.7 KiB
Python
69 lines
1.7 KiB
Python
"""
|
|
This is an implementation of Pigeon Hole Sort.
|
|
For doctests run following command:
|
|
|
|
python3 -m doctest -v pigeon_sort.py
|
|
or
|
|
python -m doctest -v pigeon_sort.py
|
|
|
|
For manual testing run:
|
|
python pigeon_sort.py
|
|
"""
|
|
|
|
|
|
def pigeon_sort(array):
|
|
"""
|
|
Implementation of pigeon hole sort algorithm
|
|
:param array: Collection of comparable items
|
|
:return: Collection sorted in ascending order
|
|
>>> pigeon_sort([0, 5, 3, 2, 2])
|
|
[0, 2, 2, 3, 5]
|
|
>>> pigeon_sort([])
|
|
[]
|
|
>>> pigeon_sort([-2, -5, -45])
|
|
[-45, -5, -2]
|
|
"""
|
|
if len(array) == 0:
|
|
return array
|
|
|
|
# Manually finds the minimum and maximum of the array.
|
|
min = array[0]
|
|
max = array[0]
|
|
|
|
for i in range(len(array)):
|
|
if array[i] < min:
|
|
min = array[i]
|
|
elif array[i] > max:
|
|
max = array[i]
|
|
|
|
# Compute the variables
|
|
holes_range = max - min + 1
|
|
holes = [0 for _ in range(holes_range)]
|
|
holes_repeat = [0 for _ in range(holes_range)]
|
|
|
|
# Make the sorting.
|
|
for i in range(len(array)):
|
|
index = array[i] - min
|
|
if holes[index] != array[i]:
|
|
holes[index] = array[i]
|
|
holes_repeat[index] += 1
|
|
else:
|
|
holes_repeat[index] += 1
|
|
|
|
# Makes the array back by replacing the numbers.
|
|
index = 0
|
|
for i in range(holes_range):
|
|
while holes_repeat[i] > 0:
|
|
array[index] = holes[i]
|
|
index += 1
|
|
holes_repeat[i] -= 1
|
|
|
|
# Returns the sorted array.
|
|
return array
|
|
|
|
|
|
if __name__ == "__main__":
|
|
user_input = input("Enter numbers separated by comma:\n")
|
|
unsorted = [int(x) for x in user_input.split(",")]
|
|
print(pigeon_sort(unsorted))
|